July 2023
Beginner to intermediate
350 pages
9h 39m
English
Content preview from Data Wrangling with SQL
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7
Subqueries and CTEs
This chapter explores the vital concepts of subqueries and common table expressions (CTEs) in SQL for data manipulation. We cover their usage within SELECT statements, including filtering, aggregation, and joining data. Advanced topics such as nested and correlated subqueries are discussed, along with the introduction of CTEs to break down complex transformations. Performance considerations and optimization techniques are emphasized. Practical examples demonstrate the application of subqueries and CTEs in real-world data-wrangling tasks, showcasing their versatility and power. By the end, you’ll have a comprehensive understanding of leveraging these features for efficient data analysis and decision-making.
In this chapter, ...
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